I was taught that you must use the plain form of a verb before から. Recently I've noticed that I will use the ます form of verbs. Most often I'm saying ～がありますから instead of ～があるから。 I feel like it's not right but it comes out so naturally. I'm worried that it seems natural because it's become a habit that no one has ever corrected.
I know that you can use ～ですから to end a sentence, so is ～ますから also grammatically correct?